#pragma comment(linker,"/STACK:100000000")
#include "testlib.h"
#include <stdio.h>
int main()
{
	registerValidation();
	int n;
	n=inf.readInt(2, 100, "N"); inf.readEoln();
	ensuref(n%2==0, "N must be even");
	inf.readEof();
	return 0;
}